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clay-html-renderer.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Clay - UI Layout Library</title>
<style>
html,
body {
width: 100%;
height: 100%;
overflow: hidden;
padding: 0;
margin: 0;
pointer-events: none;
}
@font-face {
font-family: 'Calistoga';
font-style: normal;
font-weight: 400;
src: url('/fonts/Calistoga-Regular.ttf') format('truetype');
}
@font-face {
font-family: 'Quicksand';
font-style: normal;
font-weight: 400;
src: url('/fonts/Quicksand-Semibold.ttf') format('truetype');
}
body>canvas {
width: 100%;
height: 100%;
}
div,
a,
img {
position: absolute;
box-sizing: border-box;
-webkit-backface-visibility: hidden;
}
a {
cursor: pointer;
pointer-events: all;
}
.text {
pointer-events: all;
white-space: pre;
}
</style>
</head>
<script type="module">
const CLAY_RENDER_COMMAND_TYPE_NONE = 0;
const CLAY_RENDER_COMMAND_TYPE_RECTANGLE = 1;
const CLAY_RENDER_COMMAND_TYPE_BORDER = 2;
const CLAY_RENDER_COMMAND_TYPE_TEXT = 3;
const CLAY_RENDER_COMMAND_TYPE_IMAGE = 4;
const CLAY_RENDER_COMMAND_TYPE_SCISSOR_START = 5;
const CLAY_RENDER_COMMAND_TYPE_SCISSOR_END = 6;
const CLAY_RENDER_COMMAND_TYPE_CUSTOM = 7;
const GLOBAL_FONT_SCALING_FACTOR = 0.8;
let renderCommandSize = 0;
let scratchSpaceAddress = 0;
let heapSpaceAddress = 0;
let memoryDataView;
let textDecoder = new TextDecoder("utf-8");
let previousFrameTime;
let fontsById = [
// YOUR FONTS HERE
];
let elementCache = {};
let imageCache = {};
let colorDefinition = {
type: 'struct', members: [
{ name: 'r', type: 'float' },
{ name: 'g', type: 'float' },
{ name: 'b', type: 'float' },
{ name: 'a', type: 'float' },
]
};
let stringDefinition = {
type: 'struct', members: [
{ name: 'length', type: 'uint32_t' },
{ name: 'chars', type: 'uint32_t' },
]
};
let borderDefinition = {
type: 'struct', members: [
{ name: 'width', type: 'uint32_t' },
{ name: 'color', ...colorDefinition },
]
};
let cornerRadiusDefinition = {
type: 'struct', members: [
{ name: 'topLeft', type: 'float' },
{ name: 'topRight', type: 'float' },
{ name: 'bottomLeft', type: 'float' },
{ name: 'bottomRight', type: 'float' },
]
};
let rectangleConfigDefinition = {
name: 'rectangle', type: 'struct', members: [
{ name: 'color', ...colorDefinition },
{ name: 'cornerRadius', ...cornerRadiusDefinition },
{ name: 'link', ...stringDefinition },
{ name: 'cursorPointer', type: 'uint8_t' },
]
};
let borderConfigDefinition = {
name: 'text', type: 'struct', members: [
{ name: 'left', ...borderDefinition },
{ name: 'right', ...borderDefinition },
{ name: 'top', ...borderDefinition },
{ name: 'bottom', ...borderDefinition },
{ name: 'betweenChildren', ...borderDefinition },
{ name: 'cornerRadius', ...cornerRadiusDefinition }
]
};
let textConfigDefinition = {
name: 'text', type: 'struct', members: [
{ name: 'textColor', ...colorDefinition },
{ name: 'fontId', type: 'uint16_t' },
{ name: 'fontSize', type: 'uint16_t' },
{ name: 'letterSpacing', type: 'uint16_t' },
{ name: 'lineHeight', type: 'uint16_t' },
{ name: 'disablePointerEvents', type: 'uint8_t' }
]
};
let imageConfigDefinition = {
name: 'image', type: 'struct', members: [
{ name: 'imageData', type: 'uint32_t' },
{
name: 'sourceDimensions', type: 'struct', members: [
{ name: 'width', type: 'float' },
{ name: 'height', type: 'float' },
]
},
{ name: 'sourceURL', ...stringDefinition }
]
};
let customConfigDefinition = {
name: 'custom', type: 'struct', members: [
{ name: 'customData', type: 'uint32_t' },
]
}
let renderCommandDefinition = {
name: 'CLay_RenderCommand',
type: 'struct',
members: [
{
name: 'boundingBox', type: 'struct', members: [
{ name: 'x', type: 'float' },
{ name: 'y', type: 'float' },
{ name: 'width', type: 'float' },
{ name: 'height', type: 'float' },
]
},
{ name: 'config', type: 'uint32_t' },
{ name: 'text', ...stringDefinition },
{ name: 'id', type: 'uint32_t' },
{ name: 'commandType', type: 'uint32_t', },
]
};
function getStructTotalSize(definition) {
switch (definition.type) {
case 'union':
case 'struct': {
let totalSize = 0;
for (const member of definition.members) {
let result = getStructTotalSize(member);
if (definition.type === 'struct') {
totalSize += result;
} else {
totalSize = Math.max(totalSize, result);
}
}
return totalSize;
}
case 'float': return 4;
case 'uint32_t': return 4;
case 'uint16_t': return 2;
case 'uint8_t': return 1;
default: {
throw "Unimplemented C data type " + definition.type
}
}
}
function readStructAtAddress(address, definition) {
switch (definition.type) {
case 'union':
case 'struct': {
let struct = { __size: 0 };
for (const member of definition.members) {
let result = readStructAtAddress(address, member);
struct[member.name] = result;
if (definition.type === 'struct') {
struct.__size += result.__size;
address += result.__size;
} else {
struct.__size = Math.max(struct.__size, result.__size);
}
}
return struct;
}
case 'float': return { value: memoryDataView.getFloat32(address, true), __size: 4 };
case 'uint32_t': return { value: memoryDataView.getUint32(address, true), __size: 4 };
case 'uint16_t': return { value: memoryDataView.getUint16(address, true), __size: 2 };
case 'uint8_t': return { value: memoryDataView.getUint16(address, true), __size: 1 };
default: {
throw "Unimplemented C data type " + definition.type
}
}
}
function getTextDimensions(text, font) {
// re-use canvas object for better performance
window.canvasContext.font = font;
let metrics = window.canvasContext.measureText(text);
return { width: metrics.width, height: metrics.fontBoundingBoxAscent + metrics.fontBoundingBoxDescent };
}
function createMainArena(arenaStructAddress, arenaMemoryAddress) {
let memorySize = instance.exports.Clay_MinMemorySize();
// Last arg is address to store return value
instance.exports.Clay_CreateArenaWithCapacityAndMemory(arenaStructAddress, memorySize, arenaMemoryAddress);
}
async function init() {
await Promise.all(fontsById.map(f => document.fonts.load(`12px "${f}"`)));
window.htmlRoot = document.body.appendChild(document.createElement('div'));
window.canvasRoot = document.body.appendChild(document.createElement('canvas'));
window.canvasContext = window.canvasRoot.getContext("2d");
window.mousePositionXThisFrame = 0;
window.mousePositionYThisFrame = 0;
window.mouseWheelXThisFrame = 0;
window.mouseWheelYThisFrame = 0;
window.touchDown = false;
let zeroTimeout = null;
addEventListener("wheel", (event) => {
window.mouseWheelXThisFrame = event.deltaX * -0.1;
window.mouseWheelYThisFrame = event.deltaY * -0.1;
clearTimeout(zeroTimeout);
zeroTimeout = setTimeout(() => {
window.mouseWheelXThisFrame = 0;
window.mouseWheelYThisFrame = 0;
}, 10);
});
function handleTouch(event) {
if (event.touches.length === 1) {
window.touchDown = true;
window.mousePositionXThisFrame = event.changedTouches[0].pageX;
window.mousePositionYThisFrame = event.changedTouches[0].pageY;
}
}
document.addEventListener("touchstart", handleTouch);
document.addEventListener("touchmove", handleTouch);
document.addEventListener("touchend", () => {
window.touchDown = false;
window.mousePositionXThisFrame = 0;
window.mousePositionYThisFrame = 0;
})
document.addEventListener("mousemove", (event) => {
window.mousePositionXThisFrame = event.x;
window.mousePositionYThisFrame = event.y;
});
document.addEventListener("mousedown", (event) => {
window.mouseDown = true;
});
document.addEventListener("keydown", (event) => {
if (event.key === "ArrowDown") {
window.arrowKeyDownPressedThisFrame = true;
}
if (event.key === "ArrowUp") {
window.arrowKeyUpPressedThisFrame = true;
}
});
const importObject = {
clay: {
measureTextFunction: (addressOfDimensions, textToMeasure, addressOfConfig) => {
let stringLength = memoryDataView.getUint32(textToMeasure, true);
let pointerToString = memoryDataView.getUint32(textToMeasure + 4, true);
let textConfig = readStructAtAddress(addressOfConfig, textConfigDefinition);
let textDecoder = new TextDecoder("utf-8");
let text = textDecoder.decode(memoryDataView.buffer.slice(pointerToString, pointerToString + stringLength));
let sourceDimensions = getTextDimensions(text, `${Math.round(textConfig.fontSize.value * GLOBAL_FONT_SCALING_FACTOR)}px ${fontsById[textConfig.fontId.value]}`);
memoryDataView.setFloat32(addressOfDimensions, sourceDimensions.width, true);
memoryDataView.setFloat32(addressOfDimensions + 4, sourceDimensions.height, true);
}
},
};
const { instance } = await WebAssembly.instantiateStreaming(
fetch("./index.wasm"), importObject
);
memoryDataView = new DataView(new Uint8Array(instance.exports.memory.buffer).buffer);
scratchSpaceAddress = instance.exports.__heap_base.value;
heapSpaceAddress = instance.exports.__heap_base.value + 1024;
let arenaAddress = scratchSpaceAddress;
window.instance = instance;
createMainArena(arenaAddress, heapSpaceAddress);
instance.exports.Clay_Initialize(arenaAddress);
renderCommandSize = getStructTotalSize(renderCommandDefinition);
renderLoop();
}
function MemoryIsDifferent(one, two, length) {
for (let i = 0; i < length; i++) {
if (one[i] !== two[i]) {
return true;
}
}
return false;
}
function renderLoopHTML() {
let capacity = memoryDataView.getUint32(scratchSpaceAddress, true);
let length = memoryDataView.getUint32(scratchSpaceAddress + 4, true);
let arrayOffset = memoryDataView.getUint32(scratchSpaceAddress + 8, true);
let scissorStack = [{ nextAllocation: { x: 0, y: 0 }, element: htmlRoot, nextElementIndex: 0 }];
for (let i = 0; i < length; i++, arrayOffset += renderCommandSize) {
let entireRenderCommandMemory = new Uint32Array(memoryDataView.buffer.slice(arrayOffset, arrayOffset + renderCommandSize));
let renderCommand = readStructAtAddress(arrayOffset, renderCommandDefinition);
let parentElement = scissorStack[scissorStack.length - 1];
let element = null;
if (!elementCache[renderCommand.id.value]) {
let elementType = 'div';
switch (renderCommand.commandType.value & 0xff) {
case CLAY_RENDER_COMMAND_TYPE_RECTANGLE: {
if (readStructAtAddress(renderCommand.config.value, rectangleConfigDefinition).link.length.value > 0) {
elementType = 'a';
}
break;
}
case CLAY_RENDER_COMMAND_TYPE_IMAGE: { elementType = 'img'; break; }
default: break;
}
element = document.createElement(elementType);
element.id = renderCommand.id.value;
if (renderCommand.commandType.value === CLAY_RENDER_COMMAND_TYPE_SCISSOR_START) {
element.style.overflow = 'hidden';
}
elementCache[renderCommand.id.value] = {
exists: true,
element: element,
previousMemoryCommand: new Uint8Array(0),
previousMemoryConfig: new Uint8Array(0),
previousMemoryText: new Uint8Array(0)
};
}
let elementData = elementCache[renderCommand.id.value];
element = elementData.element;
if (Array.prototype.indexOf.call(parentElement.element.children, element) !== parentElement.nextElementIndex) {
if (parentElement.nextElementIndex === 0 || !parentElement.element.childNodes[parentElement.nextElementIndex - 1]) {
parentElement.element.insertAdjacentElement('afterbegin', element);
} else {
parentElement.element.childNodes[parentElement.nextElementIndex - 1].insertAdjacentElement('afterend', element);
}
}
elementData.exists = true;
// Don't get me started. Cheaper to compare the render command memory than to update HTML elements
let dirty = MemoryIsDifferent(elementData.previousMemoryCommand, entireRenderCommandMemory, renderCommandSize);
parentElement.nextElementIndex++;
elementData.previousMemoryCommand = entireRenderCommandMemory;
let offsetX = scissorStack.length > 0 ? scissorStack[scissorStack.length - 1].nextAllocation.x : 0;
let offsetY = scissorStack.length > 0 ? scissorStack[scissorStack.length - 1].nextAllocation.y : 0;
if (dirty) {
element.style.transform = `translate(${Math.round(renderCommand.boundingBox.x.value - offsetX)}px, ${Math.round(renderCommand.boundingBox.y.value - offsetY)}px)`
element.style.width = Math.round(renderCommand.boundingBox.width.value) + 'px';
element.style.height = Math.round(renderCommand.boundingBox.height.value) + 'px';
}
// note: commandType is packed to uint8_t and has 3 garbage bytes of padding
switch(renderCommand.commandType.value & 0xff) {
case (CLAY_RENDER_COMMAND_TYPE_NONE): {
break;
}
case (CLAY_RENDER_COMMAND_TYPE_RECTANGLE): {
let config = readStructAtAddress(renderCommand.config.value, rectangleConfigDefinition);
let configMemory = new Uint8Array(memoryDataView.buffer.slice(renderCommand.config.value, renderCommand.config.value + config.__size));
let linkContents = config.link.length.value > 0 ? textDecoder.decode(new Uint8Array(memoryDataView.buffer.slice(config.link.chars.value, config.link.chars.value + config.link.length.value))) : 0;
memoryDataView.setUint32(0, renderCommand.id.value, true);
if (linkContents.length > 0 && (window.mouseDownThisFrame || window.touchDown) && instance.exports.Clay_PointerOver(0)) {
window.location.href = linkContents;
}
if (!dirty && !MemoryIsDifferent(configMemory, elementData.previousMemoryConfig, config.__size)) {
break;
}
if (linkContents.length > 0) {
element.href = linkContents;
}
if (linkContents.length > 0 || config.cursorPointer.value) {
element.style.pointerEvents = 'all';
element.style.cursor = 'pointer';
}
elementData.previousMemoryConfig = configMemory;
let color = config.color;
element.style.backgroundColor = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
if (config.cornerRadius.topLeft.value > 0) {
element.style.borderTopLeftRadius = config.cornerRadius.topLeft.value + 'px';
}
if (config.cornerRadius.topRight.value > 0) {
element.style.borderTopRightRadius = config.cornerRadius.topRight.value + 'px';
}
if (config.cornerRadius.bottomLeft.value > 0) {
element.style.borderBottomLeftRadius = config.cornerRadius.bottomLeft.value + 'px';
}
if (config.cornerRadius.bottomRight.value > 0) {
element.style.borderBottomRightRadius = config.cornerRadius.bottomRight.value + 'px';
}
break;
}
case (CLAY_RENDER_COMMAND_TYPE_BORDER): {
let config = readStructAtAddress(renderCommand.config.value, borderConfigDefinition);
let configMemory = new Uint8Array(memoryDataView.buffer.slice(renderCommand.config.value, renderCommand.config.value + config.__size));
if (!dirty && !MemoryIsDifferent(configMemory, elementData.previousMemoryConfig, config.__size)) {
break;
}
elementData.previousMemoryConfig = configMemory;
if (config.left.width.value > 0) {
let color = config.left.color;
element.style.borderLeft = `${config.left.width.value}px solid rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`
}
if (config.right.width.value > 0) {
let color = config.right.color;
element.style.borderRight = `${config.right.width.value}px solid rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`
}
if (config.top.width.value > 0) {
let color = config.top.color;
element.style.borderTop = `${config.top.width.value}px solid rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`
}
if (config.bottom.width.value > 0) {
let color = config.bottom.color;
element.style.borderBottom = `${config.bottom.width.value}px solid rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`
}
if (config.cornerRadius.topLeft.value > 0) {
element.style.borderTopLeftRadius = config.cornerRadius.topLeft.value + 'px';
}
if (config.cornerRadius.topRight.value > 0) {
element.style.borderTopRightRadius = config.cornerRadius.topRight.value + 'px';
}
if (config.cornerRadius.bottomLeft.value > 0) {
element.style.borderBottomLeftRadius = config.cornerRadius.bottomLeft.value + 'px';
}
if (config.cornerRadius.bottomRight.value > 0) {
element.style.borderBottomRightRadius = config.cornerRadius.bottomRight.value + 'px';
}
break;
}
case (CLAY_RENDER_COMMAND_TYPE_TEXT): {
let config = readStructAtAddress(renderCommand.config.value, textConfigDefinition);
let configMemory = new Uint8Array(memoryDataView.buffer.slice(renderCommand.config.value, renderCommand.config.value + config.__size));
let textContents = renderCommand.text;
let stringContents = new Uint8Array(memoryDataView.buffer.slice(textContents.chars.value, textContents.chars.value + textContents.length.value));
if (MemoryIsDifferent(configMemory, elementData.previousMemoryConfig, config.__size)) {
element.className = 'text';
let textColor = config.textColor;
let fontSize = Math.round(config.fontSize.value * GLOBAL_FONT_SCALING_FACTOR);
element.style.color = `rgba(${textColor.r.value}, ${textColor.g.value}, ${textColor.b.value}, ${textColor.a.value})`;
element.style.fontFamily = fontsById[config.fontId.value];
element.style.fontSize = fontSize + 'px';
element.style.pointerEvents = config.disablePointerEvents.value ? 'none' : 'all';
elementData.previousMemoryConfig = configMemory;
}
if (stringContents.length !== elementData.previousMemoryText.length || MemoryIsDifferent(stringContents, elementData.previousMemoryText, stringContents.length)) {
element.innerHTML = textDecoder.decode(stringContents);
}
elementData.previousMemoryText = stringContents;
break;
}
case (CLAY_RENDER_COMMAND_TYPE_SCISSOR_START): {
scissorStack.push({ nextAllocation: { x: renderCommand.boundingBox.x.value, y: renderCommand.boundingBox.y.value }, element, nextElementIndex: 0 });
break;
}
case (CLAY_RENDER_COMMAND_TYPE_SCISSOR_END): {
scissorStack.splice(scissorStack.length - 1, 1);
break;
}
case (CLAY_RENDER_COMMAND_TYPE_IMAGE): {
let config = readStructAtAddress(renderCommand.config.value, imageConfigDefinition);
let srcContents = new Uint8Array(memoryDataView.buffer.slice(config.sourceURL.chars.value, config.sourceURL.chars.value + config.sourceURL.length.value));
if (srcContents.length !== elementData.previousMemoryText.length || MemoryIsDifferent(srcContents, elementData.previousMemoryText, srcContents.length)) {
element.src = textDecoder.decode(srcContents);
}
elementData.previousMemoryText = srcContents;
break;
}
case (CLAY_RENDER_COMMAND_TYPE_CUSTOM): break;
}
}
for (const key of Object.keys(elementCache)) {
if (elementCache[key].exists) {
elementCache[key].exists = false;
} else {
elementCache[key].element.remove();
delete elementCache[key];
}
}
}
function renderLoop(currentTime) {
const elapsed = currentTime - previousFrameTime;
previousFrameTime = currentTime;
instance.exports.UpdateDrawFrame(scratchSpaceAddress, window.innerWidth, window.innerHeight, window.mouseWheelXThisFrame, window.mouseWheelYThisFrame, window.mousePositionXThisFrame, window.mousePositionYThisFrame, window.touchDown, window.mouseDown, elapsed / 1000);
renderLoopHTML();
requestAnimationFrame(renderLoop);
window.mouseDown = false;
}
init();
</script>
<body>
</body>
</html>